CN216404710U

CN216404710U - Sewing machine without swing seat

Info

Publication number: CN216404710U
Application number: CN202121827082.9U
Authority: CN
Inventors: 林子春; 林群; 李质彬; 潘林勇; 刘霖; 林高宏
Original assignee: Qixing Intelligent Technology Co Ltd
Current assignee: Qixing Intelligent Technology Co Ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-04-29
Anticipated expiration: 2031-08-05

Abstract

The application provides a sewing machine without a swing seat, which is provided with a driving motor, a cam and a connecting rod, wherein the driving motor drives the cam on an output shaft to enable the connecting rod to move up and down so as to realize basic power output; the connecting rod is hinged with the crank, the crank is fixed on the cloth feeding shaft, and the crank and the cloth feeding shaft are driven to swing at a certain angle by utilizing the up-and-down movement of the connecting rod, so that the cloth feeding teeth can obtain front and back cloth feeding actions. The sewing machine of this application does not have the swing seat, realizes needle gauge regulation and zero needle gauge location of feed dog through control driving motor, has simple to operate, and the structure is retrencied, effectively reduces sewing machine manufacturing cost, reduces the advantage to the high reliance of lubricating system by a wide margin.

Description

Sewing machine without swing seat

Technical Field

The application provides a no swing seat sewing machine, concretely relates to sewing machine technical field.

Background

A sewing machine is a machine for forming one or more stitches on a material to be sewn by using one or more sewing threads to interlace or sew one or more layers of the material, and is capable of sewing fabrics such as cotton, hemp, silk, wool, rayon, etc., and products such as leather, plastic, paper, etc. The existing sewing device generally has an important part of a swing seat, which is arranged between a connecting rod and a step-sending shaft crank, so that the needle pitch adjusting function is realized, and subsequently, many sewing machine manufacturers propose to control the adjustment of the needle pitch by using a stepping motor, but the driving of the stepping motor is carried out by depending on the swing seat, the structure is more complex, and the manufacturing cost is relatively high; in addition, the dependence on the lubrication system is large, and much inconvenience is brought to maintenance and assembly.

Disclosure of Invention

To complicated, the manufacturing cost is high, the maintenance assembly is inconvenient and to the great not enough of lubricating system dependence among the current sewing machine technique, the technical problem that this application will solve lies in simple to operate, and the modular no swing seat sewing machine is retrencied to the structure has driving motor, cam and connecting rod, its characterized in that, the cam on the driving motor drive output shaft makes the connecting rod produce the action of activity from top to bottom, connecting rod hinge crank, the crank is fixed on the work feed shaft.

Preferably, the cam is provided with a shaft hole, the shaft hole of the cam is sleeved on the output shaft, and the cam is fastened on the output shaft; the cam is also provided with an eccentric running surface, the connecting rod is provided with a matching part matched with the eccentric running surface, the matching part is sleeved on the eccentric running surface, the other end of the connecting rod is hinged with the crank, the crank is fixed on the cloth feeding shaft, one end of the cloth feeding shaft, which is close to the cloth feeding teeth, is provided with a cloth feeding tooth holder, the cloth feeding tooth holder is hinged with a cloth feeding tooth frame, and the cloth feeding tooth is fixedly arranged on the cloth feeding tooth holder.

Preferably, the driving motor drives the output shaft and the cam to change the swing angle of the connecting rod, the needle pitch is larger when the swing angle of the connecting rod is larger, and the needle pitch is smaller when the swing angle of the connecting rod is smaller.

Preferably, when the driving motor drives the output shaft and the cam to enable the connecting rod to be in the lowest position state, the feed dog is located at the zero-gauge position of the feed dog at the rearmost plane on the needle plate through the crank, the feed shaft, the feed dog seat, the feed dog frame and the feed dog.

Preferably, the output shaft is further provided with a presser foot lifting cam, and the thread trimming crank is further fixedly mounted at the presser foot lifting cam.

Preferably, the thread trimming crank and the presser foot lifting cam are fixedly arranged on the output shaft.

Preferably, the sewing machine is provided with a thread cutting and presser foot lifting mechanism, the thread cutting and presser foot lifting mechanism is further provided with a presser foot lifting ejector rod, a presser foot lifting execution end, a thread cutting fork wheel and a thread cutting execution end, the thread cutting crank is provided with a pushing piece, the pushing piece is arranged at the tail end eccentric position of the thread cutting crank, the pushing piece pushes the thread cutting fork wheel to realize thread cutting action, the thread cutting fork wheel is provided with a thread cutting return rod and a thread cutting push rod, the pushing piece is arranged between the thread cutting return rod and the thread cutting push rod, and an idle surface is used for avoiding the transmission of power generated by the driving motor during driving to the presser foot lifting ejector rod.

Preferably, the presser foot lifting cam is provided with an idle surface and a presser foot lifting surface, the idle surface is used for avoiding power transmission when the output shaft is driven by the driving motor, the presser foot lifting cam is driven by the driving motor to rotate towards the direction of the presser foot lifting surface from the original idle surface state, the presser foot lifting cam rotates to enable the presser foot lifting surface to act on the presser foot lifting ejector rod, and the highest point of the presser foot lifting ejector rod abutting against the presser foot lifting surface is the highest state of the presser foot lifting.

Preferably, the driving motor drives the output shaft to drive the trimming crank to rotate continuously, the pushing piece acts on the trimming return rod until the trimming return rod returns to the original position, and the presser foot lifting cam rotates from the highest point of the presser foot to the idle surface within a preset period of time to realize the downward placement of the presser foot.

Compared with the prior art, the beneficial effects of this application are: the sewing machine without the swing seat is convenient to install, simple in structure and capable of forming a modular product, and convenient to install on various sewing machines of different models. Modular's drive arrangement standardizes on the one hand in the manufacturing, does benefit to the improvement of product quality, and on the other hand sewing machine is more convenient in installation or maintenance, also does benefit to the sewing machine who installs additional simultaneously and uses this product, has higher spreading value. The control system drives the cam and the connecting rod through the driving motor to drive the cloth feeding shaft to indirectly realize the front and back cloth feeding actions of the sewing work of the cloth feeding teeth, and the connecting rod and the crank are not provided with the swinging seat.

Drawings

FIG. 1 is a schematic view of a swing seat-less sewing machine according to the present application;

FIG. 2 is a schematic view of a feed dog driving mechanism of a sewing machine without a swing seat according to the present application;

FIG. 3 is a view of a linkage structure of a sewing machine without a swing base according to the present application;

FIG. 4 is a structural view of an eccentric wheel of a sewing machine without a swing base according to the present application.

FIG. 5 is a schematic view of a second embodiment of a sewing machine without a swing seat according to the present application;

FIG. 6 is a schematic view of a second thread trimming and presser foot lifting structure of an embodiment of a sewing machine without a swing seat according to the present application;

FIG. 7 is a schematic view of a second presser foot lifting cam structure of an embodiment of a sewing machine without a swing seat according to the present application.

Reference numerals: the cloth feeding mechanism comprises a driving motor 10, a cam 11, a shaft hole 111, an eccentric operation surface 112, an output shaft 12, a connecting rod 13, a matching part 131, a crank 14, a cloth feeding shaft 15, a cloth feeding tooth seat 16, a cloth feeding tooth rack 17, a cloth feeding tooth 18, a needle plate upper plane 19, a shaft rod 21, a presser foot lifting cam 31, an idle rotation surface 311, a presser foot lifting surface 312, a presser foot lifting peak 3121, a presser foot lifting ejector rod 32, a presser foot lifting execution end 33, a trimming crank 41, a pushing piece 411, a trimming fork wheel 42, a trimming return rod 421, a trimming pushing rod 422, a trimming execution end 423, a spindle motor 51, a tooth lifting connecting rod 52 and a pressing shaft 53.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 7, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

Example one

The sewing machine without the swing seat has the advantages that the swing seat is not needed by traditional needle pitch adjustment, and all functions of normal sewing can be achieved.

The sewing machine without the swing seat comprises a driving motor 10, a cam 11, an output shaft 12, a connecting rod 13, a matching part 131, a crank 14, a cloth feeding shaft 15, a cloth feeding tooth seat 16, a cloth feeding tooth frame 17, a cloth feeding tooth 18 and the like. In the cloth feeding driving mechanism, a control system drives a cam 11 and a connecting rod 13 through a driving motor 10 to drive a cloth feeding shaft 15 to indirectly realize the front and back cloth feeding actions of sewing work of a cloth feeding tooth 18, and a swinging seat is not arranged between the connecting rod 13 and a crank 14. The technical scheme that the existing sewing machine has a swing seat is cancelled, the sewing machine cost is reduced in manufacturing, the high dependence on a lubricating system is greatly reduced in use and maintenance, the maintenance-free technical effect of no need of lubrication is achieved, in addition, the front and back cloth feeding actions of the cloth feeding driving mechanism are realized by the driving cam 11, the connecting rod 13 and the like of the simple driving motor 10, the control system realizes the needle pitch adjustment of the needle pitch adjusting mechanism and the zero-needle-pitch positioning of the cloth feeding teeth of the zero-needle-pitch positioning mechanism through controlling the driving motor 10, and the intelligent control level of the sewing machine is improved.

In the cloth feeding driving mechanism, a cam 11 is provided with a shaft hole 111, the shaft hole 111 of the cam 11 is sleeved on an output shaft 12, and the cam 11 is fastened on the output shaft 12; the cam 11 further has an eccentric operation surface 112, the connecting rod 13 has an engagement portion 131 matched with the eccentric operation surface 112, the engagement portion 131 is sleeved on the eccentric operation surface 112, the eccentric operation surface 112 is in clearance fit in the engagement portion 131, namely, the engagement portion 131 of the connecting rod 13 is sleeved on the cam 11. In summary, the driving motor 10 drives the cam 11 to enable the connecting rod 13 to move up and down, so as to realize the most basic power output in the cloth feeding driving mechanism, and the specific scheme of the application is that the driving motor 10 drives the output shaft 12 to drive the connecting rod 13 to move up and down through the eccentric operation of the eccentric operation surface 112. The other end of the connecting rod 13 is hinged with a crank 14, the crank 14 is fixed on a cloth feeding shaft 15, one end of the cloth feeding shaft 15, which is close to a cloth feeding tooth 18, is provided with a cloth feeding tooth seat 16, a cloth feeding tooth frame 17 is hinged on the cloth feeding tooth seat 16 in a matching mode, the cloth feeding tooth frame 17 is fixedly provided with the cloth feeding tooth 18, and the arrangement that no swinging seat exists between the connecting rod 13 and the crank 14 is repeated. The vertically movable connecting rod 13 makes the crank 14 and the feed shaft 15 swing at a certain angle, and makes the feed dog seat 16 and the feed dog holder 17 mounted on the feed shaft 15 swing at the same angle, so that the feed dog 18 obtains a forward and backward feeding motion. Under the drive of the spindle motor 51, the feed dog 18 is indirectly driven to carry out the up-and-down feeding action through the feed dog connecting rod 52 and the pressure-lifting shaft 53, the front-and-back feeding action of the feed dog 18 and the up-and-down feeding action of the feed dog 18 are combined with each other, namely, the two actions are fused on the feed dog 18, the feeding action required by sewing of the sewing machine is realized, and the feed dog 18 can normally feed and sew.

The needle pitch adjusting mechanism executes the needle pitch adjustment, under the control of the control system, the driving motor 10 drives the output shaft 12 and the cam 11 to change the swing angle of the connecting rod 13, the larger the swing angle of the adjusted connecting rod 13 is, the larger the needle pitch is, the smaller the swing angle of the connecting rod 13 is, the smaller the needle pitch is, therefore, the size of the needle pitch is completely realized by the driving motor 10 under the control of the control system, the needle pitch adjusting scheme of the application can realize that one sewing machine has the function of adjusting various needle pitches, and the technical defect that the existing sewing machine generally only has one sewing needle pitch is overcome.

In the feed dog zero-gauge positioning mechanism, when the feed dog zero-gauge position needs to be positioned, the driving motor 10 drives the output shaft 12 and the cam 11 under the control of the control system to enable the connecting rod 13 to be in the lowest position state, and then the feed dog 18 is enabled to be positioned at the feed dog zero-gauge position at the rearmost of the upper plane 19 of the needle plate (one side of a sewing operation worker is the rear, the front view of the sewing operation worker is the front) through the crank 14, the feed shaft 15, the feed dog seat 16, the feed dog frame 17 and the feed dog 18, and after the feed dog zero-gauge positioning mechanism is established, the sewing machine has a stable and reliable sewing process.

The application provides a no swing seat sewing machine's trimming lifts presser foot mechanism including trimming subassembly and lifting presser foot subassembly. The thread cutting assembly is arranged under a sewing machine base plate, the thread cutting assembly starts the thread cutting electromagnet to perform thread cutting action under the control of the control system, after thread cutting is completed, the presser foot lifting electromagnet arranged at the sewing machine head starts to perform presser foot lifting action of the presser foot lifting assembly, and the thread cutting assembly and the presser foot lifting assembly guarantee that sewing work of the sewing machine is finished smoothly.

Example two

The second embodiment is basically the same as the first embodiment, except that the output shaft 12 is further provided with a lifting and pressing pin cam 31, the lifting and pressing pin cam 31 is further fixedly provided with a trimming crank 41, and as another scheme, the trimming crank 41 can also be directly installed and fixed on the output shaft 12 as the lifting and pressing pin cam 31.

The thread trimming presser foot lifting mechanism further comprises a presser foot lifting ejector rod 32, a presser foot lifting execution end 33, a thread trimming fork wheel 42 and a thread trimming execution end 423. Wherein, the trimming crank 41 is provided with a pushing piece 411, and the pushing piece 411 is arranged at the tail end eccentric position of the trimming crank 41. The pushing member 411 pushes the thread cutting fork wheel 42 to realize thread cutting action, the thread cutting fork wheel 42 is provided with a thread cutting return rod 421 and a thread cutting push rod 422, the pushing member 411 is arranged between the thread cutting return rod 421 and the thread cutting push rod 422, and the idle surface 311 is used for avoiding the power generated by the driving motor 10 during driving and transmitting the power to the presser foot lifting ejector rod 32. When the driving motor 10 drives the thread trimming crank 41 on the output shaft 12, the pushing member 411 pushes the thread trimming pushing rod 422 so that the thread trimming executing end 423 executes a thread trimming action. The thread cutting fork wheel 42 is also matched with the shaft rod 21, and the thread cutting fork wheel 42 can axially rotate along with the pushing piece 411 on the shaft rod 21, so that the thread cutting fork wheel 42 is favorable for performing thread cutting action.

The presser foot lifting cam 31 has an idle surface 311 and a presser foot lifting surface 312, and the idle surface 311 serves to avoid the transmission of power when the drive motor 10 drives the output shaft 12. The presser foot lifting cam 31 is driven by the driving motor 10 to rotate in the direction of the presser foot lifting surface 312 from the state of being originally on the idle rotation surface 311, the presser foot lifting cam 31 rotates to enable the presser foot lifting surface 312 to act on the presser foot lifting ejector rod 32, and the presser foot lifting execution end 33 executes to enable the presser foot lifting ejector rod 32 to abut against the presser foot lifting highest point 3121 of the presser foot lifting surface 312 to be in the highest state of the presser foot. At this time, the link 13 indirectly pushes the feed dog 18 when the driving motor 10 is driven.

After the trimming and the presser foot lifting are completed, the driving motor 10 drives the output shaft 12 to drive the trimming crank 41 to rotate continuously, so that the pushing piece 411 acts on the trimming return rod 421 until the trimming return rod returns to the original position, and the presser foot lifting cam 31 rotates from the presser foot lifting highest point 3121 back to the idle rotation surface 311 within a preset time period, thereby realizing the presser foot lowering and lifting. At this time, the link 13 and the cam 11 rotate by one rotation by the driving motor 10, and the link 13 indirectly pushes the feed dog 18.

There is another scenario for lifting the presser foot. The driving motor 10 drives the presser foot lifting cam 31 to rotate from the idle surface 311, so that the presser foot lifting surface 312 acts on the presser foot lifting ejector rod 32 to complete the presser foot lifting action, the presser foot lifting cam 31 returns from the original path after the presser foot lifting action is completed, and the sewing action of only lifting the presser foot without cutting threads is suitable for turning of sewing stitches.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A sewing machine without swing seat is composed of drive motor, cam and connecting rod, and features that the drive motor drives the cam on output shaft to make the connecting rod move up and down, and the connecting rod is hinged to crank fixed to cloth feeding shaft.

2. A sewing machine without a swing seat as claimed in claim 1, wherein the cam has a shaft hole, the shaft hole of the cam is fitted over the output shaft and the cam is fastened to the output shaft; the cam is also provided with an eccentric running surface, the connecting rod is provided with a matching part matched with the eccentric running surface, the matching part is sleeved on the eccentric running surface, the other end of the connecting rod is hinged with the crank, the crank is fixed on the cloth feeding shaft, one end of the cloth feeding shaft, which is close to the cloth feeding teeth, is provided with a cloth feeding tooth holder, the cloth feeding tooth holder is hinged with a cloth feeding tooth frame, and the cloth feeding tooth is fixedly arranged on the cloth feeding tooth holder.

3. The sewing machine without oscillating seat according to claim 1, wherein the driving motor drives the output shaft and the cam to change the oscillating angle of the link, the larger the needle pitch, and the smaller the oscillating angle of the link, the smaller the needle pitch.

4. The sewing machine without oscillating seat as claimed in claim 1, wherein the driving motor drives the output shaft and the cam to make the connecting rod in the lowest position, and the feed dog is located at the zero gauge position of the feed dog at the rearmost position of the upper plane of the needle plate by the crank, the feed shaft, the feed dog seat, the feed dog holder and the feed dog.

5. The sewing machine without the swing seat as claimed in claim 1, wherein the output shaft is further provided with a presser foot lifting cam, and a thread trimming crank is further fixedly mounted at the presser foot lifting cam.

6. A sewing machine without a swinging seat as claimed in claim 5, wherein the thread trimming crank and the presser foot lifting cam are fixedly mounted on the output shaft.

7. The sewing machine without the swing seat according to claim 5, wherein the sewing machine has a thread trimming presser foot lifting mechanism, the thread trimming presser foot lifting mechanism further has a presser foot lifting ram, a presser foot lifting actuating end, a thread trimming fork wheel and a thread trimming actuating end, the thread trimming crank has a pushing member, the pushing member is arranged at the end eccentric position of the thread trimming crank, the pushing member pushes the thread trimming fork wheel to realize the thread trimming action, the thread trimming fork wheel has a thread trimming return rod and a thread trimming push rod, and the pushing member is arranged between the thread trimming return rod and the thread trimming push rod.

8. The sewing machine of claim 5, wherein the presser foot lifting cam has an idle surface for avoiding power transmission when the driving motor drives the output shaft, and a presser foot lifting surface rotated by the driving motor from an original idle surface state toward the presser foot lifting surface direction, the idle surface for avoiding power transmission generated by the driving motor during driving to the presser foot lifting ejector rod, the presser foot lifting cam being rotated to cause the presser foot lifting surface to act on the presser foot lifting ejector rod, and the highest point of the presser foot lifting ejector rod abutting against the presser foot lifting surface being the highest state of the presser foot lifting.

9. The sewing machine of claim 8, wherein the drive motor drives the output shaft to rotate the thread cutting crank, the urging member acts on the thread cutting return lever until the thread cutting return lever returns to the original position, and the presser foot lifting cam rotates from the highest point of the presser foot to the idle surface within a predetermined time period to lower the presser foot.